Update readme

Author: vinser

README.md

@@ -1,10 +1,41 @@
 FLibGoLite - Just enough for free OPDS 
 ===
 
-__FLibGoLite__ is easy to use home library OPDS server you can install on your PC, NAS or server.  
+__FLibGoLite__ is an easy-to-install and resource-friendly OPDS service written in pure Go.  
 
 __Detailed multilingual guides are available [here](https://vinser.github.io/flibgolite-docs/)__
-### CURRENT STABLE RELEASE v2.2.0
+### CURRENT STABLE RELEASE v2.2.1
+
+__FLibGoLite__ main features:
+- Support for FB2 (separate files and zip archives), EPUB files.
+- Ability to convert FB2 to EPUB when downloading a book to a reader.
+- Multiplatform: Windows, MacOS, Linux. Easy to assemble for NAS under FreeBSD
+- Self-sufficient - does not require the installation of any additional libraries or applications.
+
+#### Briefly how to use FLibGoLite.
+
+You need:
+
+1. PC, NAS or server with Windows, MacOS or Linux operating system.
+2. A reader (device or application) that can work with OPDS catalogs and supports FB2 or EPUB book formats.
+
+FLibGoLite has been tested and works with mobile applications for reading books `PocketBook Reader`, `FBReader`, `Librera Reader`, `Cool Reader`,  
+as well as desktop applications `Foliate` and `Thorium Reader`.  
+You can use any other applications or devices that can read the listed book formats and work with OPDS catalogs.
+
+Follow these [guide](https://vinser.github.io/flibgolite-docs/en/docs/user-guide/) to install FLibGoLite on your PC and  
+put your books in FB2 format (zip-archives or separate files) or EPUB in the `books/stock` folder.  
+The service processes them and enters the books details into the catalog.
+
+Next, configure the reader(s) to work with the OPDS directory `http://server:8085/opds`,  
+where `server` is the name of your PC or the IP address of the PC type `192.168.0.10`  
+After that, you can select and download any of the books stored on the PC in the reader.  
+Books can be selected/searched by author and genre, as well as contextual search by author and/or book title.  
+For book readers that do not support the FB2 format, books can be converted to EPUB format when loaded.
+
+Thus, you will create a library that will be used by your loved ones with smartphones, reader devices or PCs.
+
+Good luck!
 
 ---
 ___*Suggestions, bug reports and comments are welcome [here](https://github.com/vinser/flibgolite/issues)*___